Ads Target Wal-Mart on Container Screening

DALLAS -- A union-backed group on Thursday began airing a commercial in 16 U.S. cities alleging that Wal-Mart Stores Inc. does not support comprehensive scanning of cargo containers at U.S. ports.

WakeUpWalMart.com, operated by the United Food and Commercial Workers union, accuses Wal-Mart and the Retail Industry Leaders Association trade group in the 30-second television spot of lobbying against legislation to scan all incoming port containers.